<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8"/>
  <meta name="viewport" content="width=device-width"/>
  <title>Media Queries: max-width</title>
  <style>
      div {
          height: 100px;
          padding: 32px;
          border: 12px solid;
          margin: 12px;
      }

      .c1 {
          background: red
      }

      .c2 {
          background: darkred;
      }

      .c3 {
          background: indianred;
      }

      .c4 {
          background: orangered;
      }
  </style>
</head>

<body>
<div class="c1">1</div>
<div class="c2">2</div>
<div class="c3">3</div>
<div class="c4">4</div>
</body>
</html>